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Electroplating method for internal surface of crystallizer

An inner surface and mold technology, applied in the field of mold inner surface electroplating, can solve problems such as cracks in hard chrome plating, scratch mold, scrap copper tubes, etc., achieve high fatigue resistance, improve service life, and combine firmly. Effect

Inactive Publication Date: 2006-03-29
SHOUGANG CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The thickness of the coating is 60-80μm. Since the thermal expansion coefficient of hard chrome is very different from that of the copper substrate, cracks occur in the hard chrome coating during use, and it is easy to fall off, scratch the crystallizer, and cause the copper tube to be scrapped.

Method used

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Effect test

Embodiment Construction

[0010] The present invention is realized under the following electroplating solution and process conditions.

[0011] Because the copper tube of the crystallizer is pulling the steel billet, the coating is subjected to downward pulling force at high temperature, and at the same time, it is also subjected to the intermittent thermal load impact of the heat conduction process. The coating is prone to fatigue and cracks and falls off. In order to improve the bonding force between the coating and the substrate, Roughen the inner surface of the crystallizer copper tube and grind it evenly with 80-120 sandpaper.

[0012] Since the copper tube of the crystallizer to be plated has less oil stain, after the copper tube of the crystallizer is evenly polished, degrease with decontamination powder, rinse after the degreasing process, and then activate with sulfuric acid. The treatment time is 2- 3 minutes, then rinse with deionized water, and then conduct electroplating after 30 seconds o...

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Abstract

The present invention relates to a crystallizer inner surface electroplating method for raising service life of crystallizer, and is characterized by that said method includes the following steps: firstly, making the coppr tube to be plated undergo the process of coarsing treatment, the simple removing grease and electrolytic degreasing, using sulfuric acid to make activation treatment, electroplating nickel-cobalt alloy, and said electroplating solution contains NiSO4.6H2O, NiCl.6H2O, CoSO4.6H2O, H3BO3, sodium lauryl sulfate and benzoic sulfimide. By adopting said invention the electroplating laye and base body have strong combination force, and said electroplating layer has good abrasive resistance.

Description

Technical field [0001] The invention relates to a method for electroplating nickel-cobalt alloy on the inner surface of billets, rectangular billets and combination billets and rectangular billet crystallizers or electroplating hard chromium on the inner surface of the nickel-cobalt alloy. Background technique [0002] At present, the billet crystallizer copper tube is electroplated with a layer of hard chrome on its inner surface. The thickness of the coating is 60-80μm. Since the thermal expansion coefficient of hard chromium is very different from that of the copper substrate, cracks will occur in the hard chromium coating during use, and it is easy to fall off, scratch the crystallizer, and cause the copper tube to be scrapped. . Contents of the invention [0003] In order to overcome the above-mentioned shortcomings of the existing electroplating method for the inner surface of the crystallizer, the present invention provides an electroplating method for the inner su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/54C25D3/12
Inventor 齐德志许晓东刘念华李本海白学军蔡保春董延生刘根林
Owner SHOUGANG CORPORATION
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